>TIGR00233 trpS tryptophanyl-tRNA synthetase; InterPro: IPR002306 The aminoacyl-tRNA synthetases (6.1.1. from EC) catalyse the attachment of an amino acid to its cognate transfer RNA molecule in a highly specific two-step reaction. These proteins differ widely in size and oligomeric state, and have limited sequence homology . The 20 aminoacyl-tRNA synthetases are divided into two classes, I and II. Class I aminoacyl-tRNA synthetases contain a characteristic Rossman fold catalytic domain and are mostly monomeric . Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices , and are mostly dimeric or multimeric, containing at least three conserved regions , , . However, tRNA binding involves an alpha-helical structure that is conserved between class I and class II synthetases. In reactions catalysed by the class I aminoacyl-tRNA synthetases, the aminoacyl group is coupled to the 2'-hydroxyl of the tRNA, while, in class II reactions, the 3'-hydroxyl site is preferred. The synthetases specific for arginine, cysteine, glutamic acid, glutamine, isoleucine, leucine, methionine, tyrosine, tryptophan and valine belong to class I synthetases; these synthetases are further divided into three subclasses, a, b and c, according to sequence homology. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases . Tryptophanyl-tRNA synthetase (6.1.1.2 from EC) is an alpha2 dimer that belongs to class Ib. The crystal structure of tryptophanyl-tRNA synthetase is known .; GO: 0000166 nucleotide binding, 0004830 tryptophan-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006436 tryptophanyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=96.46  E-value=0.029  Score=35.89  Aligned_cols=93  Identities=12%  Similarity=0.177  Sum_probs=62.5

Q ss_pred             CEEEEECCCCCCCC-CCCHHHHHHHHHHHHHHHHHH--HCCCCEEECCCCCCCCHHHHHHHHHCCCCHHHHHHHHHHHHH
Q ss_conf             81799788899998-832224789789999999988--589803623643702279999999839998999999999999
Q gi|255764461|r    5 EKLYISTAIAYPNA-QPHIGHAYEMIIADVLARFHR--LDGLDVLFTTGTDEHGQKIAKAAQNAGVTTKVFVDQNSRNFR   81 (511)
Q Consensus         5 ~~~~vt~~~Py~ng-~lHlGH~~~~i~~D~~~R~~r--~~G~~v~~~~g~D~hg~~i~~~A~~~g~~p~e~~~~~~~~~~   81 (511)
T Consensus         2 ~~~~~tG~~PS--Gd~~HlGnylg~~~----~~~~~~~q~~~~~~~~~aD~-h--a~~~~---~~l~~~~~~~~~~~e~~   69 (366)
T TIGR00233         2 KFRVLTGIQPS--GDKMHLGNYLGAIR----LKVLQEEQEGYELFFCIADL-H--AITVK---QDLTDPDTLRKAREELV   69 (366)
T ss_pred             CCEEEECCCCC--CCCCCCCCHHHHHH----HHHHHHHHCCCCEEEEEECC-H--HHHCC---CCCCHHHHHHHHHHHHH
T ss_conf             84788354576--87644330066788----88777431689768997372-5--65146---78881778999999999


Q ss_pred             HHHHHHCCCCC---CCCCCCCH---HHHHHHHHH
Q ss_conf             99998088988---67477888---899999999
Q gi|255764461|r   82 DMADVLDISYD---DFIRTTEK---RHHDTCRIL  109 (511)
Q Consensus        82 ~~~~~~~i~~D---~~~rT~~~---~~~~~~~~~  109 (511)
T Consensus        70 ~~~lA~GlDP~K~~~f~QS~~~G~~~~~~l~~~l  103 (366)
T TIGR00233        70 ADYLAVGLDPEKTTIFLQSEVPGGTEHYELAWLL  103 (366)
T ss_pred             HHHHHHCCCHHHEEEEEECCCCCCHHHHHHHHHH
T ss_conf             9998726473146787505766514578999999